Perspective: Here’s what the government’s dietary guidelines should really say
Dietary research about eggs has vilified and exonerated them, over and over. By Tamar Haspel Tamar Haspel Email Bio Follow Columnist, Food March 26 I have a confession. When the call went out to recruit members of the 2020 Dietary Guidelines advisory committee, I thought about throwing my hat in the ring. I’ve got a few things to say, and I figured maybe there was room on the committee for a journalist.
Prominent in the charge to change the way we do science is John Ioannidis, professor of health research and policy at Stanford University. In 2005, he published “Why Most Research Findings Are False” in the journal PLOS Medicine, and he has been making science headlines ever since.
There’s no better way to understand the shortcomings of an FFQ than to fill one out. Maybe you know how often you ate pie last year, but do you know how often you ate “foods with oils added or with oils used in cooking ”? A host of studies of self-reported data have found that up to two-thirds of respondents report eating a diet so inconsistent with their caloric needs as to be implausible.
In studies, red meat consumption correlates as much with dying in an accident as it does with dying from heart disease. Frank Hu lives in the house and is understandably less enthusiastic about the incendiary approach. He chairs the department of nutrition at Harvard’s T.H. Chan School of Public Health, arguably ground zero of nutritional epidemiology.
Big differences in what people eat track with other differences. Heavy plant-eaters are different from, say, heavy meat-eaters in all kinds of ways . Red meat consumption correlates with increased risk of dying in an accident as much as dying from heart disease. The amount of faith we put in observational studies is a judgment call.
Over and over, large population studies get sliced and diced, and it’s all but impossible to figure out what’s signal and what’s noise. Researchers try to do that with controlled trials to test the connections, but those have issues too. They’re expensive, so they’re usually small and short-term. People have trouble sticking to the diet being studied.
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